At over 3000 EDHREC inclusions its the third most popular multicoloured card from MH2, and those numbers are going to keep growing as we see more enchantment-matters cards printed in the future
Rogues are often related mechanically to mill, so you can have an aggressive/tempo build with rogues attacking every turn and have mill as a subproduct
Thassa, God of the Sea is a fine choice
Its a 2/3 Nightmare Hydra for 1BGU which has deathtouch and can tap for two mana of any one color
Mana Crypt taps for 2, and Mana Vault, Thran Dynamo, Basalt Monolith, and Grim Monolith can tap for three easily enough and make even more mana than 5
The other card, Mulan, Disguised Soldier, is also perfect for the early game, as you can play it to potentially draw into one of your many powerful items and create a chain of drawing more cards